juko | 75600dc830232b8ef52da717e6cf07ba6739f8efe02b480c80eb67de6a2c6b6c

General

Target
2026-07-23_f5b07309dd3c188454ebb0078a238443_elex_wannacry.exe
Size 39KB
Sample260723-ydvmdstyey
SHA256 75600dc830232b8ef52da717e6cf07ba6739f8efe02b480c80eb67de6a2c6b6c
MD5 f5b07309dd3c188454ebb0078a238443
SHA1 a70f0789d561c6a3982158411e81f37b3fec27e1
SHA512 d0a2ed64446463e4e676034729fbab35e41dada7a01edca32db4b4d18cb1aef364bfcc4bdff23c5af7934f8aa61fdc2313805f245c52bba555e6df770c0fbb21
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBP:aLsF2Kerc64sTiX2IV0DVyIGFE
TLSH
T10B036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery execution juko persistence trojan

Malware Config

Signatures

Family: Juko
Juko is a trojan written in C++.
trojan juko

Detects Juko 7 IoCs

resource	yara_rule
behavioral1/memory/1072-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x00210000000231d5-5.dat	family_juko
behavioral1/memory/1072-12-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/4336-14-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x000800000002460c-15.dat	family_juko
behavioral1/memory/5728-17-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/5728-18-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation	2026-07-23_f5b07309dd3c188454ebb0078a238443_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3053180483-1881419501-3594244048-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
4336	WINWORD.exe
5728	WINWORD.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3053180483-1881419501-3594244048-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WINWORD = "C:\\Users\\Admin\\AppData\\Roaming\\Mozilla\\WINWORD.exe -r"	WINWORD.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
3536	cmd.exe

System Location Discovery: System Language Discovery 1 TTPs 7 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-07-23_f5b07309dd3c188454ebb0078a238443_elex_wannacry.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 4 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
964	PING.EXE
3392	PING.EXE
5040	PING.EXE
3536	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
964	PING.EXE
3392	PING.EXE
5040	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1072 wrote to memory of 4336	1072	2026-07-23_f5b07309dd3c188454ebb0078a238443_elex_wannacry.exe	86
PID 4336 wrote to memory of 3536	4336	WINWORD.exe	87
PID 3536 wrote to memory of 964	3536	cmd.exe	89
PID 3536 wrote to memory of 3392	3536	cmd.exe	91
PID 3536 wrote to memory of 5040	3536	cmd.exe	92
PID 3536 wrote to memory of 5728	3536	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-07-23_f5b07309dd3c188454ebb0078a238443_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-07-23_f5b07309dd3c188454ebb0078a238443_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1072
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4336
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c ping 127.0.0.1 -n 2&del "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe"&ping 127.0.0.1 -n 2&rename "C:\Users\Admin\AppData\Roaming\Mozilla\00007BE3" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:3536
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:964
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:3392
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:5040
  - - C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
      "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      System Location Discovery: System Language Discovery
      PID:5728

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00007BE3

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007BE3
Size 39KB
SHA256 cee4b9f28a66cbcc1de24c80bbe765358c4710bedc4ff93e5388267a90ec2d2c
MD5 c828054be317efb460c25feddef69a0c
SHA1 e9e158a22a8d105fb774ada10f7c078244660079
SHA512 abe3e3b95614a3e3ed584b4ffee79eb8ddcd215072c90f0afd4070b024e6f05609d89b82d3cd2e4a4b3e5251d80b686bbb10957dbeaeea85afc6e9be94ced4af
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBq:aLsF2Kerc64sTiX2IV0DVyIGF1
TLSH
T198036B1B2964B062C69611B0F8696F34C03D9DB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 75600dc830232b8ef52da717e6cf07ba6739f8efe02b480c80eb67de6a2c6b6c
MD5 f5b07309dd3c188454ebb0078a238443
SHA1 a70f0789d561c6a3982158411e81f37b3fec27e1
SHA512 d0a2ed64446463e4e676034729fbab35e41dada7a01edca32db4b4d18cb1aef364bfcc4bdff23c5af7934f8aa61fdc2313805f245c52bba555e6df770c0fbb21
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBP:aLsF2Kerc64sTiX2IV0DVyIGFE
TLSH
T10B036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1072-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1072-12-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/4336-14-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5728-17-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/5728-18-0x0000000000400000-0x000000000041D000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads